【題目】The number of __________is now estimated at about 200 billion.

A.existed starsB.existing starsC.stars into existenceD.stars existent

【答案】B

【解析】

考查現(xiàn)在分詞。句意：現(xiàn)存的恒星數(shù)量現(xiàn)在估計約有2000億顆。分析可知，所填空應(yīng)是名詞短語，意為“恒星”。動詞exist，意為“存在”，與stars之間為主動關(guān)系，可用其現(xiàn)在分詞形式作為定語修飾名詞stars組成，且單個詞作定語，可放于名詞之前。故選B項。

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